Despite all their success, Macklemore & Ryan Lewis haven’t forgotten their humble beginnings. The Seattle duo took it back to basics and surprised a bus full of New Yorkers with an impromptu performance in a promo for the Grammys’ “Music Unleashes” campaign.

With boombox in hand, they boarded the bus and started performing their hit “Can’t Hold Us” for the surprised commuters, who weren’t sure what was happening. Macklemore threw a paper towel roll around while he rapped and eventually the whole bus was standing up and clapping along.

On January 26, the duo will perform on a much bigger stage at the 56th Annual Grammy Awards, where they are nominated seven times.